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Registered
Join Date: Apr 2001
Location: Linn County, Oregon
Posts: 48,899
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NOT familiar with BMW...but for my '09 Mustang I used a gadget that would plug into the always live female 12v outlet. (The cigarette lighter to us old folks) On the other end, a 9V (transistor radio) battery. The 9 volts kept everything alive while the battery was being changed.
(edit) Mine is a simple device like this one...have had it for a long time, decades. Worked fine for saving radio codes and seemed to work for the Mustang. But when searching for this, I note that there are now "memory savers" that plug into OBD II ports. Those probably work better.
https://www.summitracing.com/parts/lag-295a
(more edit)
Seems our host sells something that'll work
https://www.pelicanparts.com/cgi-bin/ksearch/pel_search_2016.cgi?SUPERCAT_FLAG=Y&command=DWsearch&description=Memory%2520savers
__________________
"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent."
-Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.)
Last edited by pwd72s; 04-30-2019 at 11:47 AM..
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